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Arizona Public Service Company is the largest electric utility in Arizona.  With 4,000 MW of generating capacity, APS serves more than one million customers in 11 counties throughout most of the state, but mainly concentrated in northern and central Arizona.  APS is one of the two major suppliers of electricity to the Phoenix metropolitan area (the other being Salt River Project [SRP]).

The utility company also operates three nuclear reactors. Its Palo Verde Nuclear Generating Station in Arizona, the largest nuclear plant in the U.S., came under scrutiny by the Nuclear Regulatory Commission in 2005 when operational problems began to cause prolonged outages.

As of 2016, APS has available one gigawatt of solar generating capacity. Approximately half is generated at large solar power stations and half at small rooftop solar systems.

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SRP serves nearly all of the Phoenix metropolitan area. A large portion of its electric service territory is shared with Arizona Public Service (APS).


Besides the power generated at several of the dams along the Salt River, SRP owns or operates, in part, several power generating stations throughout the state:

  • Agua Fria Generating Station

  • Coronado Generating Station

  • Craig Generating Station

  • Desert Basin Generating Station

  • Four Corners Generating Station (owns 10%, operated by APS)

  • Hayden Generating Station

  • Kyrene Generating Station

  • Mesquite Generating Station

  • Navajo Generating Station (owns 21.7%)

  • Palo Verde Nuclear Generating Station (owns 17.5%, operated by APS)

  • Santan Generating Station

  • Arizona Falls


Tucson Electric Power (TEP) is an electric utility company serving southern Arizona.

TEP cutting down its use of coal and is increasing its use of natural gas and relying more heavily on its expanding renewable energy portfolio, which now includes solar, wind and other resources .

TEP Bill

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The Pacific Gas and Electric Company (PG&E) is an investor-owned electric utility (IOU) with publicly traded stock that is headquartered in the in San Francisco. PG&E provides natural gas and electricity to most of the northern two-thirds of California, from Bakersfield almost to the Oregon border which represents 5.2 million households.

PG&E generates electricity through its own assets and also buys electricity in markets.  The utility-owned generation portfolio includes nuclear, hydro, gas turbine, and solar resources.  PG&E also buys energy through contracts years in advance, as well as in day-ahead and real-time energy markets.

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PG&E Fires - NPR News
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Listen to an NPR report highlighting PG&E's role in 12 major California fires.


Southern California Edison (or SCE Corp), the largest subsidiary of Edison International, is the primary electricity supply company for much of Southern California, USA. It provides 14 million people with electricity across a service territory of approximately 50,000 square miles.


Southern California Edison still owns all of its electrical transmission facilities and equipment, but the deregulation of California's electricity market in the late 1990s forced the company to sell many of its power plants, though some were probably sold by choice. SCE still owns about half of the 1,580-MW coal-fired Mohave Generating Station in Laughlin, Nevada, which supplied electricity to California, Nevada, and Arizona.

After going solar which SCE rate plan is right for the customer?  Click here to determine.


San Diego Gas & Electric (SDG&E) provides natural gas and electricity to San Diego County and southern Orange County in southwestern California.  SDG&E is a regulated public utility that provides energy service to 3.3 million consumers through 1.4 million electric meters and more than 840,000 natural gas meters in San Diego and southern Orange counties. The utility's area spans 4,100 square miles (10,600 square kilometers). SDG&E employs about 5,000 people.

In 2004, the California Public Utilities Commission approved SDG&E's long-term energy resource plan, which relies on a balanced mix of resources to meet the growing energy needs of San Diego. That mix includes increased emphasis on energy efficiency, more renewable energy resources, and additional baseload generation plants and transmission capacity.  By 2016, 43.2% of SDG&E's electrical power sources were renewable.